Chapter 7 ___________________________________________________________ Troubleshooting
VAISALA______________________________________________________________________ 229
Problem Situations for Ultrasonic Wind Sensor
WMT703
Table 64 Some Problem Situations and Their Remedies
Problem Probable Cause Remedy
Connection to WMT703 is lost. Power supply is not
sufficient.
Check the power supply for
proper operation.
The installation site is
causing measurement
problems.
Check that the installation site
matches the requirements listed
in section Selecting Location on
page 3
3.
Wind measurement failure. WMT703 is
sending irregular data values.
Snow, ice, a bird, or
some other object is
blocking the
measurement path
between the ultrasonic
transducers.
Remove the blockage, and check
that the wind transducers are not
damaged.
If the blockage is ice or snow, it
melts after some time if you are
using a heated version of
WMT703. Duration of the
blockage depends on the severity
of the weather event.
If birds are causing the blockage,
consider installing a bird cage.
Reported wind direction is not correct. WMT703 is misaligned,
which causes an offset
error.
Realign WMT703 according to
section Aligning Ultrasonic Wind
Senso
r WMT
703 on page 67.
There is a 180-degree offset error in the
reported wind direction.
WMT703 is misaligned,
which causes an offset
error.
Rotate WMT703 to match the
proper wind direction; see section
Aligning Ultrasonic Wind Sensor
WMT7
03 on page 67
.
Incorrect <CR><LF>
settings in the terminal
program.
Configure the terminal program to
send both carriage return (<CR>)
and line feed <LF>.
The wiring might be
incorrect.
Check the wiring; refer to
Appendix A, Wiring Diagrams, on
page 263.
WMT703 does not respond to any
commands, not even OPEN
Sensor power
Inconsistent serial communication or
missing data.
Pin contacts of the
connector have become
oxidized or the
connector is not firmly
attached.
Change the WMT703 cable.
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